I see we're starting to get the 'fly by your bum' and 'de skilling' arguments this subject usually generates. Soon some bright spark will mention 'stick position'.
Pull too hard in a loop exit in a Yak 52 and be even a tiny bit out of balance and BANG, you flick. No time for any info from your bum, and there isn't any anyway. Not all aeroplanes have gentlemanly pre-stall buffet like a Chippy does!
De-skilling? I think not! If you can pull to nearly the stall angle in steep turns and aeros, you are losing no skill but gaining information, maybe life saving information if you're low down, that you didn't have before.
That Russian device Beags mentions sounds the dog's whatsits to me. Sounds typically Russian; elegantly practical. Pity they didn't fit one to the Yak!